
var curShowTimeSeconds = 0;

var balls = [];
const colors = ["#33B5E5","#0099CC","#AA66CC","#9933CC","#99CC00","#669900","#FFBB33","#FF8800","#FF4444","#CC0000"];

window.onload = function() {
	
	WINDOW_WIDTH = document.body.clientWidth;
  WINDOW_HEIGHT = document.body.clientHeight;

  MARGIN_LEFT = Math.round(WINDOW_WIDTH /10);
  RADIUS = Math.round(WINDOW_WIDTH * 4 / 5 / 108)-1;

  MARGIN_TOP = Math.round(WINDOW_HEIGHT /5);
    
	var canvas = document.getElementById('canvas');
	var context = canvas.getContext("2d");
	
	canvas.width = WINDOW_WIDTH;
	canvas.height = WINDOW_HEIGHT;
	
	curShowTimeSeconds = getCurrentShowTimeSeconds();
	setInterval(
    function(){
      render( context );
      update();
    },
    50
  );
}


function getCurrentShowTimeSeconds() {
	
    var curTime = new Date();
    var ret = curTime.getHours()*3600 + curTime.getMinutes()*60 + curTime.getSeconds();

    return ret;
}


function update(){

    var nextShowTimeSeconds = getCurrentShowTimeSeconds();

    var nextHours = parseInt( nextShowTimeSeconds / 3600);
    var nextMinutes = parseInt( (nextShowTimeSeconds - nextHours * 3600)/60 )
    var nextSeconds = nextShowTimeSeconds % 60

    var curHours = parseInt( curShowTimeSeconds / 3600);
    var curMinutes = parseInt( (curShowTimeSeconds - curHours * 3600)/60 )
    var curSeconds = curShowTimeSeconds % 60

    if( nextSeconds != curSeconds ){
        if( parseInt(curHours/10) != parseInt(nextHours/10) ){
            addBalls( MARGIN_LEFT + 0 , MARGIN_TOP , parseInt(curHours/10) );
        }
        if( parseInt(curHours%10) != parseInt(nextHours%10) ){
            addBalls( MARGIN_LEFT + 15*(RADIUS+1) , MARGIN_TOP , parseInt(curHours/10) );
        }

        if( parseInt(curMinutes/10) != parseInt(nextMinutes/10) ){
            addBalls( MARGIN_LEFT + 39*(RADIUS+1) , MARGIN_TOP , parseInt(curMinutes/10) );
        }
        if( parseInt(curMinutes%10) != parseInt(nextMinutes%10) ){
            addBalls( MARGIN_LEFT + 54*(RADIUS+1) , MARGIN_TOP , parseInt(curMinutes%10) );
        }

        if( parseInt(curSeconds/10) != parseInt(nextSeconds/10) ){
            addBalls( MARGIN_LEFT + 78*(RADIUS+1) , MARGIN_TOP , parseInt(curSeconds/10) );
        }
        if( parseInt(curSeconds%10) != parseInt(nextSeconds%10) ){
            addBalls( MARGIN_LEFT + 93*(RADIUS+1) , MARGIN_TOP , parseInt(nextSeconds%10) );
        }

        curShowTimeSeconds = nextShowTimeSeconds;
    }

    updateBalls();
    //console.log(balls.length);
}


function updateBalls(){

    for( var i = 0 ; i < balls.length ; i ++ ){

        balls[i].x += balls[i].vx;
        balls[i].y += balls[i].vy;
        balls[i].vy += balls[i].g;

        if( balls[i].y >= WINDOW_HEIGHT-RADIUS ){
            balls[i].y = WINDOW_HEIGHT-RADIUS;
            balls[i].vy = - balls[i].vy*0.66;
        }
    }
    
    var cnt = 0
    for( var i = 0 ; i < balls.length ; i ++ )
        if( balls[i].x + RADIUS > 0 && balls[i].x -RADIUS < WINDOW_WIDTH )
            balls[cnt++] = balls[i]

    while( balls.length > Math.min(500, cnt)){
        balls.pop();
    }
}


function addBalls( x , y , num ){

    for( var i = 0  ; i < digit[num].length ; i ++ )
        for( var j = 0  ; j < digit[num][i].length ; j ++ )
            if( digit[num][i][j] == 1 ){
                var aBall = {
                    x:x+j*2*(RADIUS+1)+(RADIUS+1),
                    y:y+i*2*(RADIUS+1)+(RADIUS+1),
                    g:1.5+Math.random(),
                    vx:Math.pow( -1 , Math.ceil( Math.random()*1000 ) ) * 6,
                    vy:-5,
                    color: colors[ Math.floor( Math.random()*colors.length ) ]
                }

                balls.push( aBall )
            }
}


function render(cxt) {
	
	cxt.clearRect(0,0,WINDOW_WIDTH, WINDOW_HEIGHT);
	
	var hours = parseInt( curShowTimeSeconds / 3600);
  var minutes = parseInt( (curShowTimeSeconds - hours * 3600)/60);
  var seconds = curShowTimeSeconds % 60;
	
	renderDigit(MARGIN_LEFT , MARGIN_TOP, parseInt(hours/10), cxt);
  renderDigit( MARGIN_LEFT + 15*(RADIUS+1) , MARGIN_TOP , parseInt(hours%10) , cxt )
  renderDigit( MARGIN_LEFT + 30*(RADIUS + 1) , MARGIN_TOP , 10 , cxt )
  renderDigit( MARGIN_LEFT + 39*(RADIUS+1) , MARGIN_TOP , parseInt(minutes/10) , cxt);
  renderDigit( MARGIN_LEFT + 54*(RADIUS+1) , MARGIN_TOP , parseInt(minutes%10) , cxt);
  renderDigit( MARGIN_LEFT + 69*(RADIUS+1) , MARGIN_TOP , 10 , cxt);
  renderDigit( MARGIN_LEFT + 78*(RADIUS+1) , MARGIN_TOP , parseInt(seconds/10) , cxt);
  renderDigit( MARGIN_LEFT + 93*(RADIUS+1) , MARGIN_TOP , parseInt(seconds%10) , cxt);

  for( var i = 0 ; i < balls.length ; i ++ ){
        cxt.fillStyle=balls[i].color;

        cxt.beginPath();
        cxt.arc( balls[i].x , balls[i].y , RADIUS , 0 , 2*Math.PI , true );
        cxt.closePath();

        cxt.fill();
    }
}


function renderDigit(x, y, num, cxt){
	
	cxt.fillStyle = "rgb(0, 102, 153)";
	for(var i = 0; i < digit[num].length; i++)
	  for(var j = 0; j < digit[num][i].length; j++)
	    if(digit[num][i][j] == 1){
	    	cxt.beginPath();
	    	cxt.arc(x+j*2*(RADIUS+1)+(RADIUS+1), y+i*2*(RADIUS+1)+(RADIUS+1), RADIUS, 0, 2*Math.PI);
	    	cxt.closePath();
	    	cxt.fill();
	    }
}
